Tennant, Roy, author
Reed Press, 2004
Buku Teks
edited by Diane Kresh
American Library association, 2007
eBooks
edited by Gerard Salton
Prentice-Hall, 1971
Buku Teks
Tuty Hendrawati, author
Fakultas Ilmu Komputer Universitas Indonesia, 2013
UI - Tugas Akhir
Chellappa, Rama, author
IEEE Computer Society Press, 1985
Buku Referensi